qwt_plot_abstract_canvas.h

/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_PLOT_ABSTRACT_CANVAS_H
#define QWT_PLOT_ABSTRACT_CANVAS_H
 
#include "qwt_global.h"
#include <qframe.h>
 
class QwtPlot;
 
class QWT_EXPORT QwtPlotAbstractCanvas
{
  public:
    enum FocusIndicator
    {
        NoFocusIndicator,
 
        CanvasFocusIndicator,
 
        ItemFocusIndicator
    };
 
    // Constructor
    explicit QwtPlotAbstractCanvas( QWidget* canvasWidget );
    // Destructor
    virtual ~QwtPlotAbstractCanvas();
 
    // Get the parent plot widget
    QwtPlot* plot();
    // Get the parent plot widget
    const QwtPlot* plot() const;
 
    // Set the focus indicator
    void setFocusIndicator( FocusIndicator );
    // Get the focus indicator
    FocusIndicator focusIndicator() const;
 
    // Set the border radius
    void setBorderRadius( double );
    // Get the border radius
    double borderRadius() const;
 
  protected:
    QWidget* canvasWidget();
    const QWidget* canvasWidget() const;
 
    virtual void drawFocusIndicator( QPainter* );
    virtual void drawBorder( QPainter* );
    virtual void drawBackground( QPainter* );
 
    void fillBackground( QPainter* );
    void drawCanvas( QPainter* );
    void drawStyled( QPainter*, bool );
    void drawUnstyled( QPainter* );
 
    QPainterPath canvasBorderPath( const QRect& rect ) const;
    void updateStyleSheetInfo();
 
  private:
    Q_DISABLE_COPY(QwtPlotAbstractCanvas)
 
    class PrivateData;
    PrivateData* m_data;
};
 
class QWT_EXPORT QwtPlotAbstractGLCanvas : public QwtPlotAbstractCanvas
{
  public:
    enum PaintAttribute
    {
        BackingStore = 1,
 
        ImmediatePaint = 8,
    };
 
    Q_DECLARE_FLAGS( PaintAttributes, PaintAttribute )
 
    // Constructor
    explicit QwtPlotAbstractGLCanvas( QWidget* canvasWidget );
    // Destructor
    virtual ~QwtPlotAbstractGLCanvas();
 
    // Set a paint attribute
    void setPaintAttribute( PaintAttribute, bool on = true );
    // Test a paint attribute
    bool testPaintAttribute( PaintAttribute ) const;
 
    // Set the frame style
    void setFrameStyle( int style );
    // Get the frame style
    int frameStyle() const;
 
    // Set the frame shadow
    void setFrameShadow( QFrame::Shadow );
    // Get the frame shadow
    QFrame::Shadow frameShadow() const;
 
    // Set the frame shape
    void setFrameShape( QFrame::Shape );
    // Get the frame shape
    QFrame::Shape frameShape() const;
 
    // Set the line width
    void setLineWidth( int );
    // Get the line width
    int lineWidth() const;
 
    // Set the mid line width
    void setMidLineWidth( int );
    // Get the mid line width
    int midLineWidth() const;
 
    // Get the frame width
    int frameWidth() const;
    // Get the frame rect
    QRect frameRect() const;
 
    virtual void invalidateBackingStore() = 0;
 
  protected:
    void replot();
    void draw( QPainter* );
 
  private:
    virtual void clearBackingStore() = 0;
 
    class PrivateData;
    PrivateData* m_data;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotAbstractGLCanvas::PaintAttributes )
 
#endif